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0 APPENDIX A -ORE AND WASTE SPLP SAMPLING AND TASTING <br />The uranium-vanadium deposit that will be mined is hosted in the fluvial sandstones of the Salt <br />Wash member of the Morrison Formation. Almost all the ore in this mine, as well as the other older <br />mines in the Beaver Mesa/John Brown district occurs in the upper sandstone sequence of the Salt <br />Wash member, referred to as the Top Rim. Smaller deposits occur in a lower sandstone, referred to <br />as Middle Rim, separated from the Top Rim by some thirty to seventy feet of mudstone. The <br />physical characteristics and mineral composition of the Top and Middle Rims are essentially the <br />same. <br />Sandstone sequences are composed of several individual sandstone beds deposited by meandering <br />streams flowing across a large flood plain. Therefore, each sequence consists of numerous sandstone <br />lenses (one to fifteen feet thick) interbedded with thin mudstone beds. Locally, the sandstone beds <br />will be in contact with other sandstone beds yielding thick sandstone units of several tens of feet. <br />Usually, the Top Rim has a few lenticular mudstone beds of a few inches to several feet thick. <br />Habit of the uranium-vanadium mineralization is variable. Commonly, there is a thin (four inches to <br />two feet) ore streak near the top or bottom, or both, of individual sandstone beds which may extend <br />laterally to over a few hundred feet. Often there will be areas where the ore will "roll" from an upper <br />layer through the center of the sandstone to join the lower layer, making ore several feet thick. The <br />ore also tends to follow cross bedding in sandstones. The common method used to mine these.thin, <br />erratic deposits is random room-and-pillar. A technique called split-shooting is employed wherein <br />ore and intervening waste rock are blasted separately to reduce dilution. <br />Sample locations for the baseline SPLP tests were chosen to represent the varying materials to be <br />encountered during production. Samples WW-01, WW-02, and WW-03 are samples of ore which <br />represent a "roll" configuration, a sandstone bottom layer, and a sandstone top layer as would be <br />expected in a normal split-shooting situation, respectively. The other three samples represent waste <br />rock that will be removed in accessing the ore. The three waste rock samples are representative of <br />the range of materials that will be mined within the ore deposit and placed in the permanent waste <br />E] I <br />W drlivind Mine April 07